What should I do if the product breaks after adding color masterbatch during the injection molding process? --Which is better between pc lens and resin lens
Under sunlight, the problem of striped pigment bands in the product needs to be considered from the physical and mechanical properties of the plastic and the plastic molding process: 1. The temperature of the injection molding equipment is not well controlled, and the color masterbatch cannot be mixed with the resin after entering the mixing chamber. Mix well. 2. The injection molding machine does not add a certain amount of back pressure, and the mixing effect of the screw is not good. 3. The dispersion of the color masterbatch is not good or the resin plasticization is not good. The process can be debugged as follows: 1. Increase the temperature of the part of the mixing chamber by the blanking port slightly 2. Apply a certain back pressure to the injection molding machine. If it is still not good after the above debugging, it may be a problem of the dispersion or matching of the color masterbatch and resin, and the masterbatch manufacturer should be contacted to solve it. After using a certain color masterbatch, the product appears to be easier to crack. This may be due to poor diffusion and mutual solubility caused by the poor quality of the dispersant or auxiliary selected by the manufacturer, which affects the physical and mechanical properties of the product. After using the color masterbatch according to the ratio on the manual, the color is too dark (too light). Although this problem is simple, there are many possibilities. Specifically: 1. The color masterbatch has not been tested carefully, and the pigment is too little or too much 2. The measurement is not accurate when used, and there are a lot of random measurement by domestic enterprises, especially small and medium-sized enterprises. 3. There is a problem with the matching of color masterbatch and resin. This may be improper selection of the carrier of color masterbatch, or the manufacturer may change the resin variety at will 4. Machine Improper temperature, the color masterbatch stays in the machine for too long. Processing procedure: Firstly, check whether the resin type matches the color masterbatch and whether the measurement is accurate. Secondly, adjust the temperature or speed of the machine. If there are still problems, you should contact the masterbatch manufacturer. For the same color masterbatch, resin and formula, why are the colors of the products injected by different injection molding machines in different shades? This is often caused by the injection molding machine. Different injection molding machines have different mechanical conditions due to different manufacturing, use time or maintenance conditions, especially the difference in the degree of close contact between the heating element and the barrel, so that the dispersion state of the color masterbatch in the barrel is also different. The phenomenon will appear. After changing to another brand of resin, the color of the same masterbatch and formula has changed. Why? The density and melt index of different grades of resin will be different, so the performance of the resin will be different, and the compatibility with the color masterbatch will also be different, resulting in a color change. Generally speaking, as long as the density and melt index are not different If the color difference is large, the color difference will not be too large, and the color can be corrected by adjusting the amount of color masterbatch. Will the migration of pigments during storage of the color masterbatch affect the quality of the product? Some color masterbatches have high pigment content (or dyes). In this case, migration is normal. Especially the color masterbatches added with dyes will cause serious migration. But this does not affect the quality of the product, because after the color masterbatch is injected into the product, the pigment is in the normal color concentration in the product. Why do some injection products have poor gloss? There are many possibilities: 1. The nozzle temperature of the injection molding machine is too low 2. The mold finish of the injection molding machine is not good 3. The product molding cycle is too long 4. The color masterbatch contains too much titanium dioxide 5. The color masterbatch is poorly dispersed After a period of time, some plastic products will fade. The basic pigments used by the manufacturers are of poor quality and drift. Which is better, pc lens or resin lens?